For the beans, cook frozen beans in boiling salted water for about 4 minutes. Pour off, rinse with cold water and drain. Peel 1 onion, chop finely and wrap each date with a slice of bacon. Halve remaining slices of bacon and wrap plums and olives around them. Heat olive oil in a large pan and fry over medium heat for 3-4 minutes, turning if necessary in two portions. Arrange on a plate, garnished with marjoram if desired
With 10 people: